[PATCH][Binutils, readelf] arm: Support for new pacbti unwind opcode 0xb5.

[Srinath Parvathaneni]

Hi,

This patch adds readelf support for decoding the exception table opcode "0xb5",
which indicates to use effective vsp as modifier for PAC validation as defined
by EHABI (https://github.com/ARM-software/abi-aa/releases/download/2022Q3/ehabi32.pdf
Section 10.3).

The testcase for this support is in the continuation patch
https://sourceware.org/pipermail/binutils/2022-November/124328.html

Regression testing for arm-none-eabi target and found no regressions.

Ok for binutils-master?

Regards,
Srinath.

binutils/ChangeLog:

2022-11-07  Srinath Parvathaneni  <srinath.parvathaneni@arm.com>

        * readelf.c (decode_arm_unwind_bytecode): Add entry to decode opcode
	0xb5.


###############     Attachment also inlined for ease of reply    ###############


diff --git a/binutils/readelf.c b/binutils/readelf.c
index 4d8e540b39b1a7089bbb31026ddbc597e3621731..c8323539a21f3d3ba757e364c06c3dc0e6e7fade 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -9916,6 +9916,8 @@ decode_arm_unwind_bytecode (Filedata *                 filedata,
 	}
       else if (op == 0xb4)
 	printf (_("     pop {ra_auth_code}"));
+      else if (op == 0xb5)
+	printf (_("     vsp as modifier for PAC validation"));
       else if ((op & 0xf8) == 0xb8 || (op & 0xf8) == 0xd0)
 	{
 	  unsigned int count = op & 0x07;



-------------- next part --------------
diff --git a/binutils/readelf.c b/binutils/readelf.c
index 4d8e540b39b1a7089bbb31026ddbc597e3621731..c8323539a21f3d3ba757e364c06c3dc0e6e7fade 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -9916,6 +9916,8 @@ decode_arm_unwind_bytecode (Filedata *                 filedata,
 	}
       else if (op == 0xb4)
 	printf (_("     pop {ra_auth_code}"));
+      else if (op == 0xb5)
+	printf (_("     vsp as modifier for PAC validation"));
       else if ((op & 0xf8) == 0xb8 || (op & 0xf8) == 0xd0)
 	{
 	  unsigned int count = op & 0x07;